Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 23, Pages 19957-19963Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b02986
Keywords
metal-organic framework; ZIF; hierarchical; particulate matter; filter
Funding
- Wearable Platform Materials Technology Center (WMC) - National Research Foundation of Korea (NRF) Grant of the Korean Government (MSIP) [2016R1A5A1009926]
- Ministry of Trade, Industry & Energy (MOTIE, Korea) under Industrial Technology Innovation Program [10070075]
- KAIST High Risk High Return Project (HRHRP) [N10180022]
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Here, we propose heterogeneous nucleation-assisted hierarchical growth of metal-organic frameworks (MOFs) for efficient particulate matter (PM) removal. The assembly of two-dimensional (2D) Zn-based zeolite imidazole frameworks (2D-ZIF-L) in deionized water over a period of time produced hierarchical ZIF-L (H-ZIF-L) on hydrophilic substrates. During the assembly, the second nucleation and growth of ZIF-L occurred on the surface of the first ZIF-L, leading to the formation of flowerlike H-ZIF-L on the substrate. The flowerlike H-ZIF-L was easily synthesized on various substrates, namely, glass, polyurethane three-dimensional foam, nylon microfibers, and nonwoven fabrics. We demonstrated H-ZIF-L-assembled polypropylene microfibers as a washable membrane filter with highly efficient PM removal property (92.5 +/- 0.8% for PM2.5 and 99.5 +/- 0.2% for PM10), low pressure drop (10.5 Pa at 25 L min(-1)), long-term stability, and superior recyclability. These outstanding particle filtering properties are mainly attributed to the unique structure of the 2D-shaped H-ZIF-L, which is tightly anchored on individual fibers comprising the membrane.
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